CDL Air Brakes Test 6 – Classic Mode

This is CDL Air Brakes Test 6 in our original Classic Mode. Simply click in your answer to each CDL practice test question. When you're finished, check your score and results. You can reset the test and retake it as needed.


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1. When you apply pressure to the brake pedal, you are...

A Putting on the brakes
B Releasing air pressure to the brakes
C Reducing air in the tanks
D Activating the safety valve

2. The air compressor is connected to the engine through...

A Gears
B Hoses
C V-Belt
D Gears or a v-belt

3. Which type of brake is the most common in commercial vehicles?

A Wedge brakes
B Disk brakes
C S Cam brakes
D Drum brakes

4. An application pressure gauge...

A Shows how much air pressure you are applying to the brakes
B Is connected to the generator
C Releases air when you accelerate
D Prevents brake failure

5. All vehicles with air brakes are required to have a low pressure warning signal. This could be...

A A red light
B A wig wag mechanical arm
C A buzzer
D Any one of the above

6. To test your service brakes you should...

A Stop the vehicle and put the parking brake on
B Release the parking brake, move forward slowly and depress brakes
C Put parking brake on and release air pressure
D Depress brakes when traveling at highway speeds

7. Stab braking occurs when you...

A Press on the brake pedal as hard as you can
B Release the brakes when the wheels lock up
C Apply the brakes when the wheels start rolling
D All of the above

8. Air brakes take longer to stop than hydraulic brakes because...

A The reaction time is longer for the driver
B It takes longer for the air to flow through the lines
C The linings get hotter more quickly
D None of the above

9. The proper way to go down long grades is to...

A Use a low gear and push hard on the brakes
B Let up on the brakes from time to time to cool them
C Use a low gear and apply constant, light pressure on the brakes
D Apply brakes just hard enough to reduce speed to five mph below safe speed then release until back to safe speed and repeat process.

10. You should avoid using the parking brake...

A on steep hills
B if the air pressure is low
C when the brakes are hot
D any time you park

End of Test #6

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